In order to use the ReleasePage API you must first enable add-ons for your page and obtain an API Key through the Management Portal.
From the Release Page list page, click on the page that you wish to access via the API, and go to the Add-ons panel.
Click the switch to enable API access to this Release Page.
You will now see your API key (this is how we identify you when making requests) and the Page ID (this is how we know when page you want to use).
This is all the information you need to get started, so head over the developer documentation to see what's possible!